The PAL-130L Keychain Alarm with Light combines the two best deterrents of an attack...a 130db alarm and a flashing light. The alarm is activated when the pin attached to the keychain is pulled. Or by pressing the button on the top of the unit. Can be used as a flashlight without activating the alarm to provide additional night time safety. One 12 volt battery included. Dimensions: 2 3/4" x 1 3/4" x 1"